It is a motor driven mechanical compactor useful for soil compaction into 100 mm or 150 mm diameter moulds. Two sets of rammers are provided, one of 2.6 and arranged for 310 mm. drop and other 4.9 kg and arranged for 450 mm fall. for comaction soil into 150 mm dia moulds, 100 mm face dia rammers having weight 2.6 kg and 489 kg are used. Where as for 100 mm dia moulds they are of 50 mm dia. The rammer assembly is provided with a ratched and pawl arrangement to lift it from the top of the soil layer. When the rammer reaches the required height the pawl release the rammer which falls freely on soil surface. The release mechanism is operated by an arm moving up and down which is connected to a reduction gear coupled to the motor through another arm. An automatic blow counter fitted to the compactor is used to set the number of blows. The base plate of the specimen mould is to be fitted to the rotating base plate of the instrument which makes 1/5th revolution per stroke. The equipment is suitable for operation on 230 volts, 50 cycles, single phase, A.C. supply. Without Moulds.